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| author | Keith Randall <khr@golang.org> | 2024-10-21 15:36:38 -0700 |
|---|---|---|
| committer | Keith Randall <khr@google.com> | 2024-10-22 16:23:12 +0000 |
| commit | 74163c895a7c5d7ebafeaed1f4a0891d218e2704 (patch) | |
| tree | e795bf155e9ce0aee3987f79f98743e56614318b /src/cmd/internal/obj | |
| parent | 4e7025860129b33f704634583d20539af19c344b (diff) | |
| download | go-74163c895a7c5d7ebafeaed1f4a0891d218e2704.tar.xz | |
cmd/compile: use STP/LDP around morestack on arm64
The spill/restore code around morestack is almost never exectued, so
we should make it as small as possible. Using 2-register loads/stores
makes sense here. Also, the offsets from SP are pretty small so the
offset almost always fits in the (smaller than a normal load/store)
offset field of the instruction.
Makes cmd/go 0.6% smaller.
Change-Id: I8845283c1b269a259498153924428f6173bda293
Reviewed-on: https://go-review.googlesource.com/c/go/+/621556
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Keith Randall <khr@google.com>
Reviewed-by: Cherry Mui <cherryyz@google.com>
Diffstat (limited to 'src/cmd/internal/obj')
| -rw-r--r-- | src/cmd/internal/obj/link.go | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/src/cmd/internal/obj/link.go b/src/cmd/internal/obj/link.go index a3e4a0d309..462b9b2bd2 100644 --- a/src/cmd/internal/obj/link.go +++ b/src/cmd/internal/obj/link.go @@ -1100,6 +1100,7 @@ type Auto struct { type RegSpill struct { Addr Addr Reg int16 + Reg2 int16 // If not 0, a second register to spill at Addr+regSize. Only for some archs. Spill, Unspill As } @@ -1192,6 +1193,10 @@ func (fi *FuncInfo) SpillRegisterArgs(last *Prog, pa ProgAlloc) *Prog { spill.As = ra.Spill spill.From.Type = TYPE_REG spill.From.Reg = ra.Reg + if ra.Reg2 != 0 { + spill.From.Type = TYPE_REGREG + spill.From.Offset = int64(ra.Reg2) + } spill.To = ra.Addr last = spill } @@ -1208,6 +1213,10 @@ func (fi *FuncInfo) UnspillRegisterArgs(last *Prog, pa ProgAlloc) *Prog { unspill.From = ra.Addr unspill.To.Type = TYPE_REG unspill.To.Reg = ra.Reg + if ra.Reg2 != 0 { + unspill.To.Type = TYPE_REGREG + unspill.To.Offset = int64(ra.Reg2) + } last = unspill } return last |